Coating composition



Patented Jan. 7, 1930 UNITED STATES PATENT OFFICE CLARENCE I. B. HENNING AND CHARLES E. BURKE, WILMINGTON, DELAWARE, AND EBENEZER EMMET REID, OF BALTIMORE, MARYLAND, ASSIGNORS TO E. I. DU PONT DE NEMOURS 8:; COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION or DELAWARE COATING COMPOSITION No Drawing. Original application filed September 24, 1824, Serial No. 739,689. Divided and this application fi1ed Iu1y 27, 1928. Serial No. 295,840.

This invention relates to new compositions of matter including heavy metal salts of a monoalkyl or monoaryl ester of phthalic acid.

These new salts are characterized by containing the following atomic grouping:

OODR

' the neutral salts having the following general graphical formula:

coon M oo.ox

where R represents an alkyl or aryl radical preferably not containing more than one ring of carbon atoms such, for example, as

methyl (011 ethyl (O,l-I cycl0-' monoalkyl phthalic acid with a solution of asoluble salt of a corresponding heavy metal, in which case the metal phthalic ester precipitates and can be separated from the supernatant liquid. If desired the compounds so prepared can be further purified by dissolving in ether, filtering any insoluble residue and then distilling off the ether.

The ferrous and ferric neutral salts of the monalkyl esters of phthalic acid (such as the salts of the n-butyl ester) are brownish red compounds; the corresponding zinc, mercurous, mercuric, plumbous, and stannous salts are colorless; the corresponding manganous and nickel (ous) salts aregreenish; and the corresponding cobaltous and cupric salts are blue. All these salts exist, at least initially, in the form of Viscous oils, except the manganese and copper salts, which are crystalline at ordinary room temperatures. The ferric and mercuric salts are somewhat unstable, and the plumbous and stannous salts are also unstable at ordinary temperatures in the presence of water. The zinc salt is unstable at temperatures above 100 C. j

The colors of the iron, cobalt, and nickel salts of the monoalkyl esters of phthalic acid,

- and the colors of films, such as nitrocellulose films, containing these salts, are remarkably fast to both visible and ultra-violet light.

' We have discovered that compounds of this type are soluble in many organic solvents such as ether and acetone, and render available an excellent method of intimately incor-v porating compounds containing the heavy metals with other or anic substances where they may function, for example 'as drying agents in paints and varnishes, or as catalytic agents in the carrying out of other chemical reactions, as-for example, hydrogenation. 0

Furthermore, we have also discovered that substances of this type form colloids with nitrocellulose and are, therefore, particularly adapted for use in cases where it is desirable to intimately incorporate a metal-containing compound with nitrocellulose.

As an example of the use according to our invention of one of the above-mentioned organo-metallic compounds, a nitrocellulose filmdof the following composition might be cite Pyroxylin 10 parts Zinc n-butyl phthalate 5 parts Volatile Solvent as required The p roxylin and zinc butyl phthalate are colloid ed in the same way that pyroxylin and camphor would be, and the Volatile solvent added to give the required consistency. Films prepared in this way are found to be uniform, transparent and possess other qualities which make them satisfactory for many purposes.

This application is a division of our application Serial No. 739,689 filed September 24, 1924.

We claim: 1. A lacquer film comprising a mixture of 5 nitrocellulose and a polyvalent metallic salt of an alkyl half ester of phthalic acid.

2. A lacquer film comprising a mixture of nitrocellulose and a polyvalent metallic salt of the butyl half ester of phthalic acid.

3. A lacquer film comprising a mixture of nitrocellulose and the zinc salt of the butyl half ester of phthalic acid.

4. A lacquer composition comprising a mixture of nitrocellulose and a polyvalent v metallic salt of an alkyl half ester of phthalic acid dissolved in a volatile solvent for nitrocellulose.

5. A lacquer composition comprising a mixture of nitrocellulose, the zinc salt of the butyl half ester of phthalic acid, and a volatile solvent mixture.

6. A composition comprising a mixture of nitrocellulose and a heavy metal salt of a monoalkyl ester of phthalic acid.

7. A composition comprising a mixture of nitrocellulose and a polyvalent metallic salt of an alkyl half-ester of phthalic acid.

8. A composition comprising a mixture of nitrocellulose, the zinc salt of the butyl halfester of phthalic acid, and a volatile solvent mixture.

In testimony whereof we aflix our signatures.

CLARENCE I. B. HENNING. CHARLES E. BURKE.

EBENEZER EMlSIET REID. 

